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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3b8cb72eeba5062f0cc217d94b63a31126fb70d5a3c0ee825a04ec24fd8ac8c' 
  AND token = 'KulYWL8hb/ReBk961+WRH0Jq9YFIx8a4s1NkMkQ9kIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}